KR950012749B1 - Low power high efficiency switching power supply - Google Patents

Low power high efficiency switching power supply

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Publication number
KR950012749B1
KR950012749B1 KR1019860004116A KR860004116A KR950012749B1 KR 950012749 B1 KR950012749 B1 KR 950012749B1 KR 1019860004116 A KR1019860004116 A KR 1019860004116A KR 860004116 A KR860004116 A KR 860004116A KR 950012749 B1 KR950012749 B1 KR 950012749B1
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Prior art keywords
connection point
power supply
winding
high efficiency
primary winding
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KR1019860004116A
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Korean (ko)
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KR870002735A (en
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에드가 화이트포드 로랜드
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더 뱁콕 앤드 윌콕스 컴퍼니
로버트 제이. 에드워즈
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
    • H02M3/3372—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration of the parallel type
    • H02M3/3374—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration of the parallel type with preregulator, e.g. current injected push-pull

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

내용 없음.No content.

Description

저전원 고효율 스위칭전원공급기Low Power High Efficiency Switching Power Supply

제 1 도는 본 발명의 회로도이다.1 is a circuit diagram of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 입력회로보 12 : 절연회로부10: input circuit beam 12: insulated circuit

14 : 출력회로부 16,18 : 입력단14: output circuit 16, 18: input terminal

20,86,88 : 저항 22 : 피드백선20,86,88: resistance 22: feedback line

24 : 에미터 26 : 트랜지스터24 emitter 26 transistor

28 : 콜렉터 30 : 베이스28: collector 30: base

32 : 정전류원 34,38,78,80,82,84 : 선32: constant current source 34,38,78,80,82,84: line

36 : 제너다이오드 40 : 중간탭36: zener diode 40: middle tap

41 : 1차권선 42 : 저손실스위칭트랜스포머41: primary winding 42: low loss switching transformer

44,46 : 소오스 48,50 : MOSFET44,46 Source 48,50 MOSFET

52,54 : 드레인 56,58 : 게이트52,54: Drain 56,58: Gate

60 : 발진기 62,64 : 2차권선60: oscillator 62,64: secondary winding

66 : 코어 68,70 : 중간탭66: core 68,70: middle tap

72,73 : 기준전압점 74,76 : 브릿지정류회로72,73 reference voltage point 74,76 bridge rectifier circuit

90,92,94,96 : 콘덴서 98,100,102,104 : 출력단90,92,94,96 Capacitor 98,100,102,104 Output Terminal

106,108 : 캐패시터여파회로106,108: capacitor filter circuit

[산업상의 이용분야][Industrial use]

본 발명은 전원공급기에 관한 것으로, 특히 4∼20mA 전류루프에 전원을 공급하기 위한 저전원 고효율 스위칭전원공급기에 관한 것이다.The present invention relates to a power supply, and more particularly, to a low power high efficiency switching power supply for supplying power to a 4-20 mA current loop.

[종래의 기술 및 그 문제점][Traditional Technology and Problems]

일반적으로 50mW 이하의 분할전압원을 제공하는 저전원공급기는 변압기에 중간탭을 설치한 전원공급기나 저효율 스위칭전원공급기에 의해 구현되고 있다.In general, a low power supply that provides a split voltage source of 50 mW or less is implemented by a power supply having an intermediate tap in a transformer or a low efficiency switching power supply.

그러나 4∼20mA 전류루프에 의해 동작되는 전원공급기에서는 회로기능을 최대로 하기 위해 고효율의 전원공급장치가 필요하게 된다.However, power supplies operated by 4-20 mA current loops require high efficiency power supplies to maximize circuit functionality.

한편, 통상적인 2선식 아날로그전송시스템은 전류루프를 형성하기 위해 2개의 선에 의해 전원공급기에 연결되어 있는 전송기를 포함하고 있는데, 이와 같은 전송기에는 통상적으로 압력이나 온도와 같은 공정변수(process variable ; PV)를 감지하는 감지기가 설치되어 있다.On the other hand, a typical two-wire analog transmission system includes a transmitter connected to a power supply by two wires to form a current loop. Such a transmitter typically includes a process variable such as pressure or temperature; Detector is installed to detect PV).

그리고, 전원공급기는 저항과 함께 2개의 선으로 연결되어 전류루프가 페루프로 형성되고, 전송기는 변환기로부터의 신호를 증폭함으로써 PV에 비례하거나 다른 방법으로 PV와 관련된 전류를 상기 전원공급기로부터 인출해내게 되는데, 여기서 종래에는 최소 4mA에서 최대 20mA까지의 전류가 인출된 다음, 저항을 통과하면서 전압강하를 일으킴으로써 상기한 PV값을 측정하도록 되어 있었다. 이때 4mA의 최소전류는 전송회로에 전원을 공급하도록 지시하는데 사용되고, 4mA이상의 초과전류는 PV를 결정하는데 사용될 수 있는 값의 역할을 하게 된다. 이 경우 상기 4∼40mA의 2선식 전송장치는 정확도의 최대오차가 0.1% 정도로 제한되고, 또한 전송기자체는 제어되지 않은 상태에서 연속적으로 데이터전송을 하도록 단일방향성으로 구성되어 있다.The power supply is connected by two wires together with a resistor so that a current loop is formed in Peru, and the transmitter amplifies the signal from the converter so that the current associated with the PV can be drawn from the power supply in proportion to or in a different way. Here, conventionally, the above-described PV value is measured by causing a voltage drop while drawing a current from a minimum of 4 mA to a maximum of 20 mA, and then passing through a resistor. At this time, the minimum current of 4mA is used to instruct to supply power to the transmission circuit, the excess current of 4mA or more serves as a value that can be used to determine the PV. In this case, the 4 to 40 mA two-wire transmitter has a maximum error of 0.1%, and the transmitter itself is unidirectionally configured to continuously transmit data in an uncontrolled state.

[발명의 목적][Purpose of invention]

본 발명은 상기한 점을 감안하여 발명된 것으로, 마이크로컴퓨터를 이용해서 4∼20mA 전류루프에 대한 상기 전송기에 전원을 공급하면서 전원공급효율을 증대시킬 수 있도록 된 저전원 고효율 스위칭전원공급기를 제공함에 그 목적이 있다.The present invention has been made in view of the above, and provides a low power high efficiency switching power supply which can increase power supply efficiency while supplying power to the transmitter for a 4 to 20 mA current loop using a microcomputer. The purpose is.

[발명의 구성][Configuration of Invention]

상기 목적을 달성하기 위한 본 발명은, 2개 이상의 부분으로 분리시키는 접속점을 갖는 1차권선(41)과 1개 이상의 2차권선(62,64)을 구비하고 있는 저손실스위칭트랜스포머(42)와, 상기 1차권선(41)에 1차전압을 인가하기 위한 "+"와 "_"입력단(16,18), 상기 입력단(16,18) 양단에 연결된 정전류원(32), 상기 입력단(16,18) 양단의 상기 정전류원(32)에 직렬로 연결되어 정전압원을 공급하는 제너다이오드(36), 상기 제너다이오드(36)의 일단에 연결된 1차권선(41)의 2개 이상의 접속점중 하나의 접속점(40), 상기 1차권선(41)의 다른 접속점과 상기 입력단(16,18)중 한 입력단사이에 연결된 소오스와 드레인을 구비한 FET(48,50), 상기 1차권선(41)에 공급된 1차전압을 교류로 변환시키기 위해 상기 FET(48,50)의 제어게이트(56,58)에 출력단이 연결된 저전원발진기(60) 및, 상기 2차권선(62,64)으로부터의 AC전압을 DC전압으로 정류하기 위해 2차권선(62,64) 양단에 연결된 전파정류기(74,76)를 구비하여 구성된 것을 특징으로 한다.The present invention for achieving the above object is a low-loss switching transformer 42 having a primary winding 41 having a connection point separated into two or more parts and one or more secondary windings (62, 64), "+" And "_" input terminals 16 and 18 for applying a primary voltage to the primary winding 41, a constant current source 32 connected to both ends of the input terminals 16 and 18, and the input terminal 16, 18) one of two or more connection points of a zener diode 36 connected in series to both ends of the constant current source 32 to supply a constant voltage source, and a primary winding 41 connected to one end of the zener diode 36; FETs 48 and 50 having a source and a drain connected between a connection point 40, another connection point of the primary winding 41 and one of the input terminals 16 and 18, and the primary winding 41 A low power oscillator 60 having an output terminal connected to the control gates 56 and 58 of the FETs 48 and 50 to convert the supplied primary voltage into alternating current, and the secondary windings 62 and 64; In order to rectify the AC voltage from the DC voltage characterized in that configured by comprising a full-wave rectifier (74,76) connected across the secondary winding (62, 64).

[작용][Action]

상기와 같이 구성된 본 발명은, 1차권선 및 2차권선을 갖춘 저손실 스위칭트랜스포머를 사용함으로써 4∼20mA의 전류루프에 적합한 전원공급기를 실현할 수 있게 된다.The present invention configured as described above can realize a power supply suitable for a current loop of 4 to 20 mA by using a low loss switching transformer having primary windings and secondary windings.

[실시예]EXAMPLE

이하, 예시도면을 참조하여 본 발명에 따른 실시예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

제 1 도는 효율이 87∼92%인 저전원 고효율 스위칭전원공급기를 위한 회로를 구성하는 예로서, 4∼20mA 전류루프장치에 사용되는 스마트전송기(온라인시 마이크로프로세서에 의해 감시되는 전송기)에 설치되는 마이크로프로세서에 대해 동작속도(응답시간)를 증가시킬 뿐만 아니라 기능을 추가할 수 있게 된다.1 is an example of constructing a circuit for a low power high efficiency switching power supply having an efficiency of 87 to 92%, and is installed in a smart transmitter (transmitter monitored by a microprocessor when online) used in a 4 to 20 mA current loop device. Not only does it increase the operating speed (response time) for the microprocessor, it also adds functionality.

또한, 본 발명은 DC12∼40V의 1차전압을 수신하기 위한 입력회로부(10)가 구비되게 되는 바, 여기에는 통상 4∼20mA 프로세서제어장치의 전류루프가 연결되게 된다.In addition, the present invention is provided with an input circuit unit 10 for receiving the primary voltage of 12 to 40V, which is usually connected to the current loop of the 4-20mA processor control device.

그리고 상기 입력회로부(10)의 기능으로서는 정전류와 전압을 절연회로부(12)에 인가시키는 역할을 하게 된다.As a function of the input circuit unit 10, a constant current and a voltage are applied to the insulating circuit unit 12.

한편, 상기 절연회로부(12)는 입력회로부(10)로부터 정전압과 정전류신호를 수신하여 출력회로부(14)에 상기 신호를 전자기적으로 결합시키게 되므로 상기 절연회로부(12)는 입력회로부(10)와 출력회로부(14)사이에 전기적 절연을 제공하게 된다.On the other hand, the insulated circuit part 12 receives the constant voltage and the constant current signal from the input circuit part 10 and electromagnetically couples the signal to the output circuit part 14, so the insulated circuit part 12 is connected to the input circuit part 10. Electrical insulation is provided between the output circuit portions 14.

그리고, 출력회로부(14)는 입력회로부(10)로부터 절연될 뿐만 아니라 여파된 출력신호를 제공하도록 +5VDC전압출력을 여파시키기 위해 2개의 통상적인 RC여파회로에 연결된 2개의 ±5VDC전원공급기로 구성되게 된다.The output circuit section 14 also consists of two ± 5 VDC power supplies connected to two conventional RC filter circuits to filter the +5 VDC voltage output to not only insulate the input circuit section 10 but also provide a filtered output signal. Will be.

또, 상기 입력회로부(10)에서는 입력단(16)과 입력단(18)에 비례적인 4∼20mA 프로세스제어루프로부터 DC12∼42V신호를 수신하게 되고, 저항(20)이 입력단(16)과 피드백선(22)에 병렬로 연결된다. 또, 트랜지스터(26)의 에미터(24)가 피드백선(22)에 병렬로 연결되면서 저항(20)에 직렬로 연결되고, 트랜지스터(26)의 콜렉터(28)는 입력단(18)에 병렬로 연결됨과 더불어 동일한 트랜지스터(26)의 베이스(30)에 연결되며, 베이스(30)는 마이크로프로세서(도시되지 않았음)와 같은 구동회로에 연결된다. 또, 정전류원(32)은 저항(20)과 에미터(24)에 병렬로 연결됨과 더불어 선(34)을 따라 제너다이오드(36)에 직렬로 연결되게 되며, 제너다이오드(36)는 입력단(18)에 병렬로 연결되게 된다.In addition, the input circuit unit 10 receives a DC 12 to 42 V signal from a 4 to 20 mA process control loop proportional to the input terminal 16 and the input terminal 18, and the resistor 20 receives the input terminal 16 and the feedback line ( 22) in parallel. In addition, the emitter 24 of the transistor 26 is connected in series with the resistor 20 while being connected in parallel with the feedback line 22, and the collector 28 of the transistor 26 is connected in parallel with the input terminal 18. In addition to being connected, it is connected to the base 30 of the same transistor 26, and the base 30 is connected to a driving circuit such as a microprocessor (not shown). In addition, the constant current source 32 is connected in parallel to the resistor 20 and the emitter 24, and is connected in series with the zener diode 36 along the line 34, the zener diode 36 is the input terminal ( 18) in parallel.

그리고 상기 절연회로부(12)는 선(34)으로부터 저손실스위칭트랜스포머(42)의 1차권선의 중간탭(40)까지 평행하게 연결된 선(38)에 의해 입력회로부(10)에 연결되고, 1차권선(41)의 양끝에는 한쌍의 MOSFET(48,50)의 소오스(44,46)가 각각 연결되며, 각각의 MOSFET(48,50)의 게이트(56,58)에는 저전원발진기(60)가 연결되게 된다.The insulated circuit portion 12 is connected to the input circuit portion 10 by a line 38 connected in parallel from the line 34 to the middle tab 40 of the primary winding of the low loss switching transformer 42. Sources 44 and 46 of a pair of MOSFETs 48 and 50 are connected to both ends of the winding 41, respectively. Low power oscillators 60 are connected to gates 56 and 58 of each MOSFET 48 and 50, respectively. Will be connected.

한편, 한쌍의 2차권선(62,64)은 저손실스위칭트랜스포머(42)의 코어(66)를 통해 설치되게 되고, 한쌍의 중간탭(68,70)은 사용자에 의해 선택된 기준전압점(72,73)에 연결되며, 2차권선(62,64)의 양측은 한쌍의 통상적인 쇼트키다이오드 브릿지정류회로(74,76)에 각각 연결된다. 또, 통상적인 한쌍의 캐패시터여파회로(106,108)는 선(78,80) 및 선(82,84)에 의해 각각 브릿지정류회로(74) 및 브릿지정류회로(76)에 연결되고, 한쌍의 저항(86)과 저항(88)은 각각의 콘덴서(90,92) 및 콘덴서(94,96)와 함께 통상의 캐패시터여파회로를 형성하게 되며, 출력회로부(14)는 각각의 캐패시터여파회로(106)와 캐패시 터여파회로(108)에 병렬로 연결된 2쌍의 출력단(98,100)과 출력단(102,104)을 제공하게 된다.On the other hand, a pair of secondary windings (62, 64) are installed through the core 66 of the low loss switching transformer 42, a pair of intermediate taps (68, 70) are selected by the user reference voltage point (72, 73, both sides of the secondary windings 62, 64 are connected to a pair of conventional Schottky diode bridge rectifying circuits 74, 76, respectively. In addition, a conventional pair of capacitor filter circuits 106 and 108 are connected to the bridge rectifying circuit 74 and the bridge rectifying circuit 76 by lines 78, 80 and 82, 84, respectively, and a pair of resistors ( 86 and resistor 88, together with the respective capacitors 90 and 92 and the capacitors 94 and 96, form a conventional capacitor filter circuit, and the output circuit section 14 is associated with each capacitor filter circuit 106. Two pairs of output terminals 98 and 100 and output terminals 102 and 104 connected in parallel to the capacitor filter circuit 108 are provided.

한편, 스위칭전원공급기가 동작하고 있는 경우, 입력회로부(10)의 입력단(16)과 입력단(18)은 공정변수(process variable)에 비례하는 4∼20mA 신호를 제공하기 위해 공정제어루프에 연결되고, 입력인 4∼20mA의 전류는 저항(20) 양단에 전압강하를 발생시키게 되며, 상기 전류는 공정변수에 비례하기 때문에 저항(20) 양단의 전압강하 또한 공정변수에 비례하게 될 뿐만 아니라 공정변수의 돌출을 위해 사용될 수 있게 된다. 그리고, 마이크로프로세서와 같은 통상적인 구동회로(도시되지 않았음)는 트랜지스터(26)의 베이스(30)를 구동시키기 위한 신호를 출력하게 될 뿐만 아니라 트랜지스터(26)의 에미터(24)에서 콜렉터(28)를 통해 흐르는 전류를 제어하게 된다.On the other hand, when the switching power supply is in operation, the input terminal 16 and the input terminal 18 of the input circuit unit 10 are connected to a process control loop to provide a 4-20 mA signal proportional to the process variable. The input current of 4 to 20 mA generates a voltage drop across the resistor 20. Since the current is proportional to the process variable, the voltage drop across the resistor 20 is also proportional to the process variable as well as the process variable. It can be used for the protrusion of. In addition, a conventional driving circuit (not shown) such as a microprocessor not only outputs a signal for driving the base 30 of the transistor 26, but also a collector (at the emitter 24 of the transistor 26). 28) to control the current flowing through.

이때, 상기 구동신호는 공정변수에 비례하게 되고, 구동회로신호에 의해 구동되는 트랜지스터(26)의 베이스(30)는 피드백선(22)를 통해 역으로 흐르는 공정변수에도 비례하게 된다.In this case, the driving signal is proportional to the process variable, and the base 30 of the transistor 26 driven by the driving circuit signal is proportional to the process variable flowing backward through the feedback line 22.

한편, 공지의 방법으로 부하에 관계없이 일정크기의 전류를 공급하는 트랜지스터와 저항으로 이루어진 공지의 정전류원(32)은 선(34,38)을 따라 절연회로부(12)에 변동이 없는 전류를 공급하게 되고, 제너다이오드(36)는 절연회로부(12) 양단에 걸리는 전압을 조절할 뿐만 아니라 절연회로부(12)로부터의 교류전원이 선(34,38)에서 입력단(18), 즉 4∼20mA 전류루프로 역류하는 것을 방지하게 된다.On the other hand, the well-known constant current source 32 consisting of a transistor and a resistor for supplying a constant current regardless of the load by a known method supplies a constant current to the insulated circuit section 12 along the lines 34, 38 In addition, the zener diode 36 not only regulates the voltage across the insulated circuit portion 12, but also the AC power from the insulated circuit portion 12 is connected to the input terminal 18, that is, the 4 to 20 mA current loop at the lines 34 and 38. To prevent backflow.

또, 상기 절연회로부(12)는 저손실스위칭트랜스포머(42)의 중간탭(10)에서 선(34,38)을 통해 입력회로부(10)의 정전류원(32)으로부터의 정전류를 인가받게 되고, 상기 저손실스위칭트랜스포머(42)는 진보된 권선배선방식으로 1차측에서 2차측에서 누설손실을 줄이기 위해 환상코일로 이루어진 코어(66)로 제작될 뿐만 아니라 코어손실을 줄이기 위해 저자속밀도(100∼500가우스)에서도 작동될 수 있도록 제작되었다.In addition, the insulated circuit part 12 receives a constant current from the constant current source 32 of the input circuit part 10 through the lines 34 and 38 at the middle tab 10 of the low loss switching transformer 42. The low loss switching transformer 42 is made of a core 66 made of annular coils to reduce leakage loss from the primary side to the secondary side in an advanced winding wiring method, and has a low flux density (100 to 500 gauss) to reduce the core loss. It is also designed to work.

한편, 저전원발진기(60)는 MOSFET(48,50) 각각의 게이트(56,58)에 교번적으로 신호를 공급하게 되고 상기 신호는 중간탭(40)으로부터 1차코일(41)과 소오스(44,46)을 통해 MOSFET(48,50)의 드레인(52,54)으로 전류가 교번적으로 인가되도록 게이트(56,58)를 턴온시키게 된다.Meanwhile, the low power oscillator 60 alternately supplies signals to the gates 56 and 58 of the MOSFETs 48 and 50, and the signals are supplied from the middle coil 40 to the primary coil 41 and the source ( Gates 56 and 58 are turned on so that current is alternately applied to drains 52 and 54 of MOSFETs 48 and 50 through 44 and 46.

종래 전원공급기에 설치된 저전원발진기(60)는 MOSFET(48,50) 대신 한쌍의 트랜지스터를 설치하여 교번적으로 구동시켰는데, 이러한 트랜지스터 대신 저전압에서도 게이트를 구동시킬 수 있으면서 신속한 스위칭 특성을 갖는 MOSFET를 사용함으로써 스위칭손실을 최소화할 수 있을 뿐만 아니라 MOSFET와 트랜스포머등에서 스위칭손실을 최대한으로 줄이기 위해 100KHz이하의 주파수대를 가져야 된다.The low-power oscillator 60 installed in the conventional power supply is alternately driven by installing a pair of transistors instead of the MOSFETs 48 and 50. Instead of these transistors, the low-power oscillator 60 can drive a gate even at a low voltage. In addition to minimizing switching losses, it is necessary to have a frequency band below 100KHz to minimize switching losses in MOSFETs and transformers.

한편, 1차코일을 통해 흐르는 교번전류는 저손실스위칭트랜스포머(42)의 2차권선(62,64)에서 점차적으로 낮아지는데, 2차권선(62,64)의 각각에는 중간탭(68,70)이 형성되고, 상기 중간탭(68,70)은 출력회로부(14)에서 2개의 +5V를 각각 출력시키기 위한 공통점으로 작용한다.On the other hand, the alternating current flowing through the primary coil is gradually lowered in the secondary windings 62 and 64 of the low loss switching transformer 42, and the intermediate taps 68 and 70 are respectively formed in the secondary windings 62 and 64. Are formed, and the intermediate tabs 68 and 70 serve as a common point for outputting two + 5Vs from the output circuit unit 14, respectively.

한편, 2차권선(62)과 2차권선(64)의 단자 양끝은 공지의 브릿지정류회로(74,76) 입력단에 연결되고, 쇼트키다이오드가 브릿지정류회로(74,76)에 설치되어 스위칭손실을 최소화시키는데, 상기 브릿지정류회로(74,76)는 공지의 방법으로 2차권선(62,64)으로부터 ACV를 DCV로 변환시키며, 이들 브릿지회로(74,76)의 출력단은 정류되지 않은 DC전압을 출력회로부(14)에 공급하게 된다.On the other hand, both ends of the secondary winding 62 and the secondary winding 64 are connected to input terminals of known bridge rectifier circuits 74 and 76, and a Schottky diode is installed in the bridge rectifier circuits 74 and 76 to switch. In order to minimize losses, the bridge rectifying circuits 74 and 76 convert ACV into DCV from secondary windings 62 and 64 in a known manner, and the output terminal of these bridge circuits 74 and 76 is a non-rectified DC. The voltage is supplied to the output circuit unit 14.

한편, 출력회로부(14)에는 절연회로부(12)에서 완전히 정류되지 않은 DC전압을 정류하여 DC+5V를 공급하는 공지의 캐패시터여파회로(106,108)가 구성되어 있는데, 출력단(98,102)에는 각각 기준점보다 낮은 DC-5V가 공급되고, 출력단(100,104)에는 각각 기준점보다 높은 직류+5V가 공급된다.On the other hand, in the output circuit section 14, there are known capacitor filter circuits 106 and 108 for rectifying a DC voltage that is not fully rectified in the insulating circuit section 12 and supplying DC + 5V. The low DC-5V is supplied, and the output terminals 100 and 104 are supplied with DC + 5V higher than the reference point, respectively.

[발명의 효과][Effects of the Invention]

상기한 바와 같이 본 발명에 따르면, 출력단(98,100)과 출력단(102,104)을 통해 신호를 공급하는 전원공급기의 효율이 87∼92%인 저전원 고효율장치로서 4∼20mA 전류루프를 사용하는 전송기를 위해 응답시간을 증가시키게 된다.As described above, according to the present invention, a low power high efficiency device having an efficiency of 87 to 92% of a power supply for supplying signals through the output terminals 98 and 100 and the output terminals 102 and 104 is used for a transmitter using a 4 to 20 mA current loop. It will increase the response time.

Claims (7)

2개 이상의 부분으로 분리시키는 접속점을 갖는 1차권선(41)과 1개 이상의 2차권선(62,64)을 구비하고 있는 저손실스위칭트랜스포머(42)와, 상기 1차권선(41)에 1차전압을 인가하기 위한 "+"와 "-"입력단(16,18), 상기 입력단(16,18) 양단에 연결된 정전류원(32), 상기 입력단(16,18) 양단의 상기 정전류원(32)에 직렬로 연결되어 정전압원을 공급하는 제너다이오드(36), 상기 제너다이오드(36)의 일단에 연결된 1차권선(41)의 2개 이상의 접속점중 하나의 접속점(40), 상기 1차권선(41)의 다른 접속점과 상기 입력단(16,18)중 한 입력단 사이에 연결된 소오스와 드레인을 구비한 FET(48,50), 상기 1차권선(41)에 공급된 1차전압을 교류로 변환시키기 위해 상기 FET(48,50)의 제어게이트(56,58)에 출력단이 연결된 저전원발진기(60) 및, 상기 2차권선(62,64)으로부터의 AC전압을 DC전압으로 정류하기 위해 2차권선(62,64) 양단에 연결된 전파정류기(74,76)를 구비하여 구성된 것을 특징으로 하는 저전원 고효율 스위칭전원공급기.Primary winding 41 having a primary winding 41 having a connection point separated into two or more portions, one or more secondary windings 62 and 64, and a primary winding to the primary winding 41 "+" And "-" input terminals 16 and 18 for applying a voltage, a constant current source 32 connected to both ends of the input terminals 16 and 18, and the constant current source 32 across the input terminals 16 and 18. Zener diode 36 connected in series to supply a constant voltage source, one of two or more connection points of the primary winding 41 connected to one end of the zener diode 36, the primary winding ( FETs 48 and 50 having a source and a drain connected between the other connection point of 41 and one of the input terminals 16 and 18, and converting the primary voltage supplied to the primary winding 41 into alternating current. In order to rectify the AC voltage from the low-power oscillator 60 and the secondary windings 62 and 64 connected to the control gates 56 and 58 of the FETs 48 and 50, Low power high efficiency switching power supply, characterized in that it comprises a full-wave rectifier (74, 76) connected to both ends of the secondary winding (62, 64). 제 1 항에 있어서, 상기 1차권선(41)의 한 접속점(40 ; 중간탭)이, 정전류원(32)이 연결된 제너다이오드(36)의 일단에 연결된 것을 특징으로 하는 저전원 고효율 스위칭전원공급기.The low power and high efficiency switching power supply according to claim 1, wherein one connection point 40 (middle tap) of the primary winding 41 is connected to one end of the zener diode 36 to which the constant current source 32 is connected. . 제 1 항에 있어서, 상기 정류기(74,76)는 1쌍의 지로가 2차권선(62,64)의 양단에 연결되고, 다른 1쌍의 지로가 2차권선(62,64)으로부터 전압여파를 촉진시키는 캐패시터필터회로(106,108) 양단에 연결된 것을 특징으로 하는 저전원 고효율 스위칭전원공급기.2. The rectifier (74, 76) has a pair of branches connected to both ends of the secondary windings (62, 64), and the other pair of branches of the rectifier (voltage) from the secondary windings (62, 64). Low power high efficiency switching power supply, characterized in that connected to both ends of the capacitor filter circuit (106,108) to promote. 제 1 항에 있어서, 상기 1차권선(41)은 별도의 접속점이 다른 접속점과 대향되는 한 접속점(40)의 일단에 설치되고, 상기 FET(50,52)가 상기 별도의 접속점과 입력선(16,18)중 1개 사이에 연결된 소오스와 드레인을 갖추며, 상기 발진기(60)가 상기 FET(50,52)의 게이트에 연결되고, 상기 트랜스포머(42)가 한 접속점과 별도의 접속점간의 1차권선(41)의 부분과 관련된 2차권선(64)과 한 접속점과 다른 접속점간의 1차권선(41)과 관련된 2차권선(62)을 포함하며, 상기 전파정류기(76)가 상기 2차권선(64) 양단에 연결된 것을 특징으로 하는 저전원 고효율 스위칭전원공급기.2. The primary winding (41) according to claim 1, wherein the primary winding (41) is provided at one end of the connection point (40) as long as a separate connection point is opposed to another connection point, and the FETs (50, 52) are provided at the separate connection point and the input line ( A source and a drain connected between one of the 16 and 18, the oscillator 60 is connected to the gates of the FETs 50 and 52, and the transformer 42 is the primary between one connection point and a separate connection point. A secondary winding 64 associated with a portion of the winding 41 and a secondary winding 62 associated with a primary winding 41 between one connection point and the other connection point, wherein the full-wave rectifier 76 includes the secondary winding. (64) A low power high efficiency switching power supply, characterized in that connected at both ends. 제 4 항에 있어서, 상기 전파정류기(76)는 1쌍의 지로가 2차권선(64)의 양단에 연결되고, 다른 1쌍의 지로가 2차권선(64)으로부터 전압여파를 촉진시키는 캐패시터필터회로(108) 양단에 연결된 것을 특징으로 하는 저전원 고효율 스위칭전원공급기.5. The capacitor rectifier of claim 4, wherein the full-wave rectifier 76 has a pair of branches connected to both ends of the secondary winding 64, and the other pair of branches have a capacitor filter for promoting voltage excitation from the secondary winding 64. A low power high efficiency switching power supply, characterized in that connected to both ends of the circuit (108). 제 4 항에 있어서, 상기 2차권선(62)은 접지에 연결된 중간탭을 포함하고, 제 1 캐패시터필터회로(106)는 각각의 일단이 정류기(74)의 2번째 지로중 하나에 연결되면서 타단이 접지에 각각 연결된 한쌍의 캐패시터(90,92)로 구성된 것을 특징으로 하는 저전원 고효율 스위칭전원공급기.5. The secondary winding (62) according to claim 4, wherein the secondary winding (62) includes an intermediate tap connected to ground, and the first capacitor filter circuit (106) has one end connected to one of the second branches of the rectifier (74). A low power high efficiency switching power supply comprising a pair of capacitors (90,92) each connected to this ground. 제 4 항에 있어서, 상기 2차권선(64)은 중간탭이 입력단의 다른 단에 연결되고, 제 2 캐패시터 필터회로(108)는 각각의 일단이 정류기(76)의 2번째 지로중 하나에 연결되면서 타단이 접지에 각각 연결된 한쌍의 캐패시터(94,96)로 구성된 것을 특징으로 하는 저전원 고효율 스위칭전원공급기.5. The secondary winding (64) according to claim 4, wherein the secondary winding (64) has an intermediate tap connected to the other end of the input stage, and the second capacitor filter circuit (108) has one end connected to one of the second branches of the rectifier (76). Low power high efficiency switching power supply, characterized in that consisting of a pair of capacitors (94, 96) connected to the other end of the ground respectively.
KR1019860004116A 1985-08-13 1986-05-26 Low power high efficiency switching power supply KR950012749B1 (en)

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US06/765,404 US4669038A (en) 1985-08-13 1985-08-13 Low power high efficiency switching power supply
US85-765,404 1985-08-13

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DE3687327T2 (en) 1993-04-29
EP0211635B1 (en) 1992-12-23

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